public void SelectChromosomes_NullGeneration_Exception()
{
var target = new TournamentSelection();
ExceptionAssert.IsThrowing(new ArgumentNullException("generation"), () =>
{
target.SelectChromosomes(2, null);
});
}
public void SelectChromosomes_TournamentSize3AllowWinnerCompeteNextTournamentFalse_ChromosomesSelected()
{
var target = new TournamentSelection(3, false);
var c0 = MockRepository.GeneratePartialMock<ChromosomeBase>(2);
c0.Fitness = 0.1;
var c1 = MockRepository.GeneratePartialMock<ChromosomeBase>(2);
c1.Fitness = 0.5;
var c2 = MockRepository.GeneratePartialMock<ChromosomeBase>(2);
c2.Fitness = 0;
var c3 = MockRepository.GeneratePartialMock<ChromosomeBase>(2);
c3.Fitness = 0.7;
var c4 = MockRepository.GeneratePartialMock<ChromosomeBase>(2);
c4.Fitness = 0.3;
var c5 = MockRepository.GeneratePartialMock<ChromosomeBase>(2);
c5.Fitness = 0.2;
var generation = new Generation(1, new List<IChromosome>() {
c0, c1, c2, c3, c4, c5
});
var mock = new MockRepository();
var rnd = mock.StrictMock<IRandomization>();
using (mock.Ordered())
{
rnd.Expect(r => r.GetUniqueInts(3, 0, 6)).Return(new int[] { 0, 1, 2 });
rnd.Expect(r => r.GetUniqueInts(3, 0, 5)).Return(new int[] { 2, 3, 4 });
rnd.Expect(r => r.GetUniqueInts(3, 0, 4)).Return(new int[] { 0, 1, 2 });
rnd.Expect(r => r.GetUniqueInts(3, 0, 3)).Return(new int[] { 0, 1, 2 });
}
RandomizationProvider.Current = rnd;
mock.ReplayAll();
var actual = target.SelectChromosomes(4, generation);
Assert.AreEqual(4, actual.Count);
Assert.AreEqual(c1, actual[0]);
Assert.AreEqual(c3, actual[1]);
Assert.AreEqual(c4, actual[2]);
Assert.AreEqual(c5, actual[3]);
}
public void SelectChromosomes_InvalidNumber_Exception()
{
var target = new TournamentSelection();
ExceptionAssert.IsThrowing(new ArgumentOutOfRangeException("number", "The number of selected chromosomes should be at least 2."), () =>
{
target.SelectChromosomes(-1, null);
});
ExceptionAssert.IsThrowing(new ArgumentOutOfRangeException("number", "The number of selected chromosomes should be at least 2."), () =>
{
target.SelectChromosomes(0, null);
});
ExceptionAssert.IsThrowing(new ArgumentOutOfRangeException("number", "The number of selected chromosomes should be at least 2."), () =>
{
target.SelectChromosomes(1, null);
});
}
public void SelectChromosomes_TournamentSizeGreaterThanAvailableChromosomes_Exception()
{
var target = new TournamentSelection(3, true);
var c0 = MockRepository.GeneratePartialMock<ChromosomeBase>(2);
c0.Fitness = 0.1;
var c1 = MockRepository.GeneratePartialMock<ChromosomeBase>(2);
c1.Fitness = 0.5;
var generation = new Generation(1, new List<IChromosome>() {
c0, c1
});
ExceptionAssert.IsThrowing(new SelectionException(target,
"The tournament size is greater than available chromosomes. Tournament size is 3 and generation 1 available chromosomes are 2."), () =>
{
target.SelectChromosomes(2, generation);
});
}
